/// <summary>
/// Render this object to the specified <see c_ref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see c_ref="GraphObjList"/> collection object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see c_ref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see c_ref="GraphPane"/> object using the
/// <see c_ref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
override public void Draw(Graphics g, PaneBase pane, float scaleFactor)
{
// Convert the arrow coordinates from the user coordinate system
// to the screen coordinate system
PointF pix1 = Location.TransformTopLeft(pane);
PointF pix2 = Location.TransformBottomRight(pane);
if (pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000)
{
// calculate the length and the angle of the arrow "vector"
double dy = pix2.Y - pix1.Y;
double dx = pix2.X - pix1.X;
float angle = (float)Math.Atan2(dy, dx) * 180.0F / (float)Math.PI;
float length = (float)Math.Sqrt(dx * dx + dy * dy);
// Save the old transform matrix
Matrix transform = g.Transform;
// Move the coordinate system so it is located at the starting point
// of this arrow
g.TranslateTransform(pix1.X, pix1.Y);
// Rotate the coordinate system according to the angle of this arrow
// about the starting point
g.RotateTransform(angle);
// get a pen according to this arrow properties
using (Pen pen = _line.GetPen(pane, scaleFactor))
//new Pen( _line._color, pane.ScaledPenWidth( _line._width, scaleFactor ) ) )
{
//pen.DashStyle = _style;
g.DrawLine(pen, 0, 0, length, 0);
}
// Restore the transform matrix back to its original state
g.Transform = transform;
}
}
/// <summary>
/// Render this object to the specified <see c_ref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see c_ref="GraphObjList"/> collection object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see c_ref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see c_ref="GraphPane"/> object using the
/// <see c_ref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
public override void Draw( Graphics g, PaneBase pane, float scaleFactor )
{
// Convert the arrow coordinates from the user coordinate system
// to the screen coordinate system
PointF pix1 = Location.TransformTopLeft( pane );
PointF pix2 = Location.TransformBottomRight( pane );
if ( pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000 )
{
// get a scaled size for the arrowhead
float scaledSize = _size * scaleFactor;
// calculate the length and the angle of the arrow "vector"
double dy = pix2.Y - pix1.Y;
double dx = pix2.X - pix1.X;
float angle = (float)Math.Atan2( dy, dx ) * 180.0F / (float)Math.PI;
float length = (float)Math.Sqrt( dx * dx + dy * dy );
// Save the old transform matrix
Matrix transform = g.Transform;
// Move the coordinate system so it is located at the starting point
// of this arrow
g.TranslateTransform( pix1.X, pix1.Y );
// Rotate the coordinate system according to the angle of this arrow
// about the starting point
g.RotateTransform( angle );
// get a pen according to this arrow properties
using ( Pen pen = _line.GetPen( pane, scaleFactor ) )
//new Pen( _color, pane.ScaledPenWidth( _penWidth, scaleFactor ) ) )
{
//pen.DashStyle = _style;
// Only show the arrowhead if required
if ( _isArrowHead )
{
// Draw the line segment for this arrow
g.DrawLine( pen, 0, 0, length - scaledSize + 1, 0 );
// Create a polygon representing the arrowhead based on the scaled
// size
PointF[] polyPt = new PointF[4];
float hsize = scaledSize / 3.0F;
polyPt[0].X = length;
polyPt[0].Y = 0;
polyPt[1].X = length - scaledSize;
polyPt[1].Y = hsize;
polyPt[2].X = length - scaledSize;
polyPt[2].Y = -hsize;
polyPt[3] = polyPt[0];
using ( SolidBrush brush = new SolidBrush( _line._color ) )
// render the arrowhead
g.FillPolygon( brush, polyPt );
}
else
g.DrawLine( pen, 0, 0, length, 0 );
}
// Restore the transform matrix back to its original state
g.Transform = transform;
}
}